Which of these is most responsible for "light adaptation"-the process by which we only gradually become able to see objects in a brightly lit place after being in the dark?
A. Cone receptors are very hyperpolarized in the dark, and they must be exposed to bright light for awhile before they will depolarize.
B. Rhodopsin is quickly inactivated in the presence of bright light so rods become unresponsive, and the higher-acuity cones then become the main detectors of vision.
C. Cones and rods are stimulated equally, leading to difficulties in interpreting the sensory inputs to the brain.
D. Because rods are more sensitive to light than cones, they gradually become extremely activated in bright light.
E. Rhodopsin is not activated by colored light, and the lack of stimulation causes rods to gradually depolarize when we are exposed to bright light.
Answer: B
You might also like to view...
A resting muscle generates most of its ATP by
A. Anaerobic respiration B. Aerobic respiration C. Resting potential D. producing more oxygen to the resting muscle
Muscles that are long and round in cross section are termed
A) longus. B) teres. C) longissimus. D) maximus. E) brevis.
What is the difference between the anatomy of the cranial nerves and that of the spinal nerves?
A) In cranial nerves, hollow cavities are empty; in spinal nerves, hollow cavities contain cerebrospinal fluid. B) In cranial nerves, damage is always fatal; in spinal nerves, damage can be healed. C) In cranial nerves, the right and left sides act independently; in spinal nerves, movement is connected. D) In cranial nerves, the white matter is surrounded by the gray matter; in spinal nerves, it is the other way around.
What is the caudal projection of the acromion found in the cat?
What will be an ideal response?